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KLEINEELDER <br /> File No 20-1008-52 A03 <br /> July 6, 1994 <br /> r <br />' 4 FIELD ACTIVITIES <br /> Kleinfelder collected a total of nine (9) soil samples from four soil borings advanced on site <br />' All of the soil borings were advanced adjacent to the tire shop at the former dispenser <br /> location <br /> 4.1 DRILLING AND SOIL SAMPLING <br /> The borings were advanced on June 2, 1994 using a truck-mounted drill rig equipped with <br /> 8-inch hollow stem augers Soil cuttings from the soil borings were placed on polyvisqueen <br /> adjacent to each boring All borings were backfilled by pumping a neat cement grout with <br /> approximately 2 percent bentoiute added to reduce shrinkage <br /> While drilling, an experienced environmental geologist classified the subsurface soil and <br /> P <br /> logged the boreholes A copy of the Unified Soil Classification System used to classify the <br /> soil and a log key are provided in Appendix A Descriptions of the sample intervals and the <br /> sora encountered in each boring are also presented in Appendix A Kleinfelder's Field <br /> Procedures for drilling and sampling are provided in Appendix B A copy of the drilling <br /> permit obtained from San Joaquin County is provided in Appendix C <br /> The four borings were advanced a maximum depth of approximately 25 feet below grade <br /> Soil samples were collected in these bormgs at 5-foot intervals from 15 feet to the bottom of <br /> the boring <br /> Generally, the soil encountered beneath the site consisted of alternating units of gray/brown <br /> clayey silt/silty clay in the upper 18'/z feet Below the clayey silt/silty clay was a brown silty <br /> sand to the maximum depths explored Groundwater was not encountered in our borings <br /> 4.2 QUALITATIVE FIELD SCREENING <br /> To provide a qualitative indication of the presence of volatile organic constituents in the soil <br /> and to monitor the constituent concentrations in the breathmg zone, a portable organic vapor <br /> analyzer was used to screen the samples in the field A photo-ionization detector (PID) was <br /> used to measure total ionizable compounds in parts per million by volume (ppmv) of vapor <br /> Each soil sample obtained in the borings was screened in the field, and the PID readings were <br /> recorded on the boring logs PID readings ranged from 0 to 45 ppmv The highest readings <br /> Copyright 1994 Kleinfelder, Inc Page 7 of 11 <br />